wifi: cw1200: fix TX padding OOB read leaking heap data to device

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Summary

CVECVE-2026-98711
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:24 UTC
Updated2026-10-21 13:21:39 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: wifi: cw1200: fix TX padding OOB read leaking heap data to device The TX path rounds the transfer size up to the bus alignment (align_size(), up to 511 bytes for SDIO, 1 byte for SPI) but sends the padded length straight from the frame buffer, which has no room reserved for the padding. cw1200_data_write() therefore reads past the end of the frame and the bus transfer carries those bytes to the device. A bogus device can collect up to 511 bytes of kernel heap data per TX frame. The RX path does not have this problem: it allocates the skb with the aligned length (alloc_len) before reading. Compute the exact padding with the bus align_size() callback, make sure queued TX frames have tailroom for it, and zero the padding bytes before the transfer so nothing past the frame is exposed. This is not expected to change driver behavior on most cases: frame contents and transfer sizes are unchanged, only the content of the padding bytes (previously undefined stale memory, now zero), which the device never reads since the WSM header carries the real frame length. The skb expansion can only fail under memory exhaustion, in which case the frame is dropped like on the existing error paths of cw1200_tx(). Discovered by Atuin - Automated Vulnerability Discovery Engine.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a910e4a94f6923c8c988565525f017f687bf7205 b66539a4dab128fafaad736b53ce15c19d14d561 git Not specified
CNA Linux Linux affected a910e4a94f6923c8c988565525f017f687bf7205 71f693a0ecccf36532dd2790f7969da6c71d5d23 git Not specified
CNA Linux Linux affected a910e4a94f6923c8c988565525f017f687bf7205 b0e97bd40e0c2cb1a3530ef8f6250aacf3224515 git Not specified
CNA Linux Linux affected a910e4a94f6923c8c988565525f017f687bf7205 678c8f4ba285649d5418a858d5d4f30c728a54ad git Not specified
CNA Linux Linux affected a910e4a94f6923c8c988565525f017f687bf7205 7c1611780823b76219cb1478db53dfd890c4a9a2 git Not specified
CNA Linux Linux affected 3.11 Not specified
CNA Linux Linux unaffected 3.11 semver Not specified
CNA Linux Linux unaffected 6.6.160 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b66539a4dab128fafaad736b53ce15c19d14d561 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b0e97bd40e0c2cb1a3530ef8f6250aacf3224515 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/71f693a0ecccf36532dd2790f7969da6c71d5d23 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7c1611780823b76219cb1478db53dfd890c4a9a2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/678c8f4ba285649d5418a858d5d4f30c728a54ad 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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